I have SBF'ed back from 4.5.588 to froyo and used redid the whole process of using z4root, droid 2 bootstrapper (per p3droid) and installed 3 part file system all worked great and running rooted 4.5.588.

and about the this not being the official OTA i called verizon and they assured me that google is pushing update and this is the real gingerbread.